Where does “kruft” come from?

kruft (Old High German) comes from Latin crypta, from Ancient Greek κρυπτός, from Ancient Greek κρύπτω, from Proto-Indo-European krāu-.

Ancestry of “kruft”, step by step

Step	Language	Word	Meaning
1	Latin	crypta	underground passage, tunnel; crypt; underground...
2	Ancient Greek	κρυπτός	concealed, hidden, secret
3	Ancient Greek	κρύπτω	to hide, cover; to conceal, obscure
4	Proto-Indo-European	krāu-	—

kruft — Etymology, Origin & Word History | Etymology Explorer